一种h形缝隙多频微带天线设计

通过对传统缝隙微带天线的分析,提出了一种h形缝隙微带天线.该天线具有多频带、小型化等特点,通过加载短路探针和在接地板挖槽的方法降低了天线的谐振频率,提高了带宽.利用基于有限元法的电磁仿真软件HFSS11.0对天线的特性进行了仿真,仿真结果表明,该天线在回波损耗S11＜-10 dB时,其工作频段为2.38～2.79 GHz,4.59～4.75 GHz和5.12～5.90 GHz,尺寸比普通微带天线降低了62.43％,从而验证了这种设计方案的有效性.该天线结构简单易于实现,能够满足无线局域网802.11a/b/g/n移动终端内置天线的多频带和小型化的要求.     

基于复合辐射器的WLAN/WiMax多频CPW微带天线

提出了一种图形结构简单,可同时工作于WLAN和WiMax频段,且具有甚好的带宽性能的新型结构微带天线。该天线辐射器由三角形、矩形和圆形辐射单元组合而成,采用共面波导(CPW)进行馈电,并利用微扰量加载调谐天线的工作频率。由此设计制作的天线实测结果表明:在802.11b/g(2.4～2.4835GHz)频段,相对阻抗带宽为34%,回波损耗优于-10dB的频段覆盖为2.03～2.87GHz;在WiMax(3.4～3.7GHz)频段,相对阻抗带宽为37%,回波损耗优于-10dB的频段覆盖为3.17～4.37GHz;在802.11a(5.15～5.825GHz)频段回波损耗优于-10dB的频率范围覆盖为4.91～6.83GHz。该天线尺寸为65mm×50mm×2mm,可以集成应用于相关微波电路系统中。文中还给出了天线的设计尺寸,并对仿真和实测结果进行了对比与讨论。     

应用于1.4 GHz的紧凑型可穿戴阵列贴片天线设计

针对天线可最大限度探测人体深层组织需降低天线的回波损耗和增加带宽性能问题,提出了一种可穿戴阵列贴片天线。该天线尺寸大小为40 mm×40 mm×2.54 mm,上下两层的介质基板厚度均为1.27 mm,添加上层介质基板是为了天线与更深的组织层匹配,将单元贴片天线以2×2的形式集成到单个基板上组成阵列,并用HFSS仿真软件搭建人体组织模型进行仿真。仿真结果表明,单元贴片天线在中心频率1.4 GHz处的回波损耗达到-20 dB,-10 dB处的阻抗带宽为1.384×1.411 GHz,阵列贴片天线在中心频率1.4 GHz处的回波损耗达到-25 dB,在-10 dB处的阻抗带宽为1.383×1.424 GHz,由于天线加工误差导致实物测量时天线的中心频率发生右移,但总体与仿真结果一致。两款天线对比可知阵列天线相较于单元天线的回波损耗更低,带宽更宽。     

用于WLAN的双频天线的设计与实现

提出了一种应用于无线局域网（WLAN）的新型双频天线。该天线采用微带线馈电的方法,其辐射面呈阶梯形,接地面为＂工＂型宽缝结构,可以覆盖IEEE802.11a/b/g（2.4～2.484GHz,5.15～5.825GHz）频段标准。其回波损耗小于10dB的阻抗带宽在2.4GHz频段可达160MHz（2.4～2.56GHz）,在5GHz频段的可达1.32GHz（5.05～6.37GHz）。整个天线在42mm×52mm、介电常数为4.5、厚度为1.5mm的FR4介质基片上实现。结果表明,该天线具有十分良好的应用潜质。     

基于复合腔结构的MEMS双模微带天线设计

设计了一种基于腔结构的双模偶极子天线,其频率在2.44GHz和4.38GHz,利用MEMS开关实现双波段的操作.根据偶极子天线原理,设计了单模微带偶极子天线,使用开关结构将两个单模偶极子天线连接在一起,实现了双模天线的功能.利用三维电磁场软件HFSS分析了设计结构,包括开关、天线,在0～10 GHz得出开关性能插入损耗在-1dB以下,天线回波损耗在-26dB以下.频率为2.44GHz时、回波损耗为-13.2dB、2dB的辐射效率为89%,频率为4.38GHz时,回波损耗为-21.9dB、3dB辐射效率为96%,带宽都在0.5GHz左右.     

基于非均匀特异媒质的赋形天线设计

在PCB板表面蚀刻不同尺寸的微带单元结构,构建非均匀特异媒质层,并将其放置在天线辐射单元前方,利用非均匀特异媒质层对电磁波不同的反射系数,实现对天线辐射波束的赋形。设计了由不同尺寸正方形贴片组成的非均匀特异媒质层,并放置于工作频率为5.8 GHz的矩形贴片天线前方。仿真和测试表明:该非均匀特异媒质层能够在基本保持贴片天线工作频点和回波损耗曲线不变条件下,通过调整与贴片天线距离,实现辐射波束由笔形波束向宽角波束和马鞍形波束的赋形转换。为赋形天线设计提供了一种有效的新方法。     

CPW馈电的超宽带天线设计

设计了一种基于共面波导(CPW)馈电的超宽带(UWB)天线。该天线由以低成本的FR4为介质基板,以馈线为中心的两个不对称的接地板和一个开口谐振环组成。天线结构简单紧凑,尺寸仅为31.6 mm×48 mm×1.6 mm。通过在其中一侧地板上方增加一个开口谐振环,不仅使天线的工作频带变宽,且也减小了天线的尺寸。最终天线的回波损耗为-10 dB,带宽为2.33～11.75 GHz。结果表明,该文设计的天线适用于无线通信系统。     

一种适用于2.4GHz无线语音的IFA天线设计

设计了一种用于2.4GHz无线语音的IFA( Inverted -F Antenna)天线,该天线能够满足2.4GHz频段无线语音传输对天线尺寸、价格和性能的要求.使用有限元法进行数值仿真和设计,该天线可达到较好的效果.该天线的仿真和实测结果表明,在2.46 GHz的中心工作频率下,回波损耗为19.9 dB,带宽约为5...     

一种新型超宽带平面单极天线的设计

提出了一种新型超宽带平面单极子天线。该天线由一个倒置的月牙形金属贴片和一个槽口金属接地板构成,采用微带线对其进行馈电。通过数值仿真和实验测量,该平面结构的单极天线具有超宽带性能,实测天线的-10dB回波损耗的频率覆盖范围为3．2～1．8GHz,相对带宽达115％,阻抗带宽达到3．6倍频。且该天线体积小、结构简单、加工简便,适合应用于短程超宽带通信系统。     

一款面向5G微基站的双频双极化电磁偶极子天线的设计与分析

小型化是进行5G微基站天线设计的重要考虑因素,文中设计了一款适用于5G微基站的电磁偶极子天线. 天线由一对正交放置的单极化电磁偶极子、一对交叉放置的渐变式Γ形馈电线、一个圆形寄生贴片和一块正方形反射板组成,工作频段为2.50~3.62 GHz和4.8~5.0 GHz,能够覆盖工信部规定的5G的全部中频段. 在工作频带内,天线的输入回波损耗小于?10 dB;端口隔离度在低频段小于?25 dB,在高频段小于?42 dB;仿真平均增益在高、低频部分分别为5.57 dBi和9.84 dBi. 该天线能够实现双频段和双极化,可以作为小型化微基站天线设计的参考,同时为5G天线的商用化提供参考.     

WLAN chip antenna mountable above the system ground plane of a mobile device

A novel wireless local-area network (WLAN) chip antenna suitable to be mounted above the system ground plane of a mobile device is presented. The antenna in the study is easily fabricated from folding a single metal plate onto a foam base, and mainly comprises a short-circuited radiating strip and an antenna ground. The antenna ground occupies the bottom surface and two adjacent side surfaces of the foam base. When the antenna is mounted at the corner of the system ground plane, this antenna ground structure is expected to effectively reduce the antenna's possible fringing electromagnetic fields inside the mobile device. In this case, when the associated element such as the radio-frequency shielding metal case is placed under the proposed antenna, small or negligible variations in the antenna performance are obtained. Design considerations of the proposed antenna for WLAN operation in the 2.4 GHz band are described, and results of the constructed prototypes are presented.     

Compact patch antenna mountable above conducting plate for wlan operation

A compact patch antenna suitable for mounting above a conducting plate for WLAN operation in the 2.4 GHz band is presented. It is demonstrated that, by introducing a supporting metal plate connected to the antenna ground below, the proposed antenna in free space can easily be mounted at the corner of a conducting plate of various dimensions without rapidly deteriorating the antenna bandwidth. With a compact size of 20times20times6 mm, the antenna can be placed very close to a conducting plate of side length varied from 20 to 200 mm for application in a PC peripheral device     

一种新型平面超宽带天线的设计

提出了一种微带线馈电的新型平面超宽带单极天线。该天线由带有弧边的金属贴片与开槽接地板构成,通过等腰梯形与圆弧形相结合的方式对接地板进行开槽,将其等分为相互耦合的两部分,起到了阻抗匹配与拓宽带宽的效果。仿真结果表明反射损耗在-10 dB以下的频率覆盖范围为3～11.8 GHz,并且在3.4～11.2 GHz频带驻波比在1.5以下,具有良好的全向辐射特性。该天线结构简单,体积小,适合在UWB通信中应用。     

叶片形超宽带单极天线

提出了一种超宽带叶片形单极天线,该天线在叶片形薄铜片上开三个孔和用相对介电常数为3.5的单层覆铜介质板作接地板。实验天线的实测结果从1.3GHz到29.7GHz约22∶1的超宽频带上,反射损耗都在-10dB以下。这种天线的频带覆盖了L、C、X、Ku各频段,应用前景十分广阔。     

Internal Ultrawideband Monopole Antenna for Wireless USB Dongle Applications

A novel, ultrawideband (UWB) monopole antenna suitable to be mounted on the printed circuit board (PCB) of a wireless, universal, serial-bus (USB) dongle as an internal antenna is presented. The proposed antenna in the study is a U-shaped, metal-plate monopole antenna, easily fabricated from bending a simple metal plate onto a foam base of a compact size of 6times11times20 mm³. The antenna mainly comprises a pair of wide-ended radiating arms and a bevel-feed transition. When the antenna is mounted at the top portion of the PCB, one end of the radiating arm is also short-circuited to the system ground plane. With the proposed antenna structure, which can provide a very wide operating bandwidth of larger than 7.6 GHz, the antenna impedance bandwidth can easily cover the 3.1-10.6 GHz UWB band. Details of the antenna design are described, and experimental results of the constructed prototypes are presented and discussed     

Double MOS Loaded Circular Microstrip Antenna with Airgap for Mobile Communication

A novel model of a wide frequency range double MOS loaded circular microstrip patch antenna with airgap between ground plane and substrate is proposed. In this structure two metal oxide semiconductor (MOS) devices are loaded on the patch to enhance the operating frequency range of antenna. To investigate the antenna, different parameters such as resonance frequency, input impedance, frequency agility, VSWR, radiation pattern etc. are calculated and simulated. The resonant frequency of proposed 10 mm radius patch is upward shifted from 5.2 to 6.8 GHz using 1 mm airgap and by loading MOS, antenna can be tuned down to 1.27 GHz operating frequency, which leads to compactness and tunability of antenna. Proposed antenna can be tuned between 1.27 and 6.8 GHz frequency of operation which makes the antenna highly suitable for wide frequency range of mobile communication. The proposed double MOS loaded antenna possessed 82.94 % frequency agility. The antenna is worth for GPS, WLAN, UMTS, and WiMAX operations.     

具有双陷波特性的六边形分形超宽带缝隙天线

提出一款具有双陷波特性的六边形分形超宽带缝隙天线,天线总尺寸为32 mmx16 mmx1.6 mm,采用六边形和三角形迭代嵌套的3阶分形结构作为辐射贴片,并采用缺陷地结构作为接地板,实现了3.0～ 15.26 GHz的超宽带带宽.在馈线两侧引入对称L形开路枝节,并在接地板上刻蚀U形窄缝隙产生了4.71～5.87 GHz...     

Conformal Antennas on Liquid Crystalline Polymer Based Rigid-Flex Substrates Integrated With the Front-End Module

Recent developments in liquid crystalline polymer (LCP)-based processing technology have shown that highly-integrated, fully-packaged radio-frequency (RF) front-end modules with high-performance can be designed by using the system-on-package (SOP) approach. However, the direct integration of a large antenna element to a small module package still remains an issue. This paper presents a novel conformal antenna structure, which results in a compact integration of the antenna and the module package for 5 GHz WLAN/WiMAX applications. The extension of 5 GHz single-band operation to 2.4/5 GHz dual-band operation is also discussed in this paper. The antenna is an inverse L-shaped monopole printed on a 25-$mu{hbox {m}}$-thick flexible LCP layer, which protrudes from a rigid multilayer organic substrate. The shielding effects of a grounded metal case, which can house the associated module circuitry, are also considered during the design process. The metal case serves as a vertical ground plane for the antenna in addition to protecting the module circuitry from the near-fields of the antenna. The flexible LCP substrate can be bent and folded over the module case, resulting in a compact design and the tight integration of the antenna with the front-end module. The details of the design and the fabrication of the proposed structure as well as the simulation and the measurement data are presented in this paper.      

Dual-band twin stepped-patch monopole antenna for WLAN application

By using twin stepped-patch radiators and a protruded ground, a micro-strip-fed monopole antenna with wide dual-band operation can be obtained. The proposed antenna with an overall size of 32 times 25 mm can excite resonances at the 2.61 and 5.52 GHz bands with impedance bandwidths of 710 MHz (2.32-3.03 GHz) and 1.56 GHz (4.77-6.33 GHz), average antenna gains of 2.9 and 3.5 dBi, respectively, and also monopole-like radiation patterns. These properties make the antenna suitable for 2.4/5.2/5.8 GHz WLAN applications.